Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 597 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🛞 Is friction helpful or a problem here: writing with a pencil? (a) helpful (b) a problem
2. 2.True or false: a rough doormat gives less friction. (a) False (b) True
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 4 N, a glass sheet 5 N, a wooden plank 6 N, a carpet 10 N. Which surface gave the most friction? (a) a wooden plank (b) a glass sheet (c) a carpet (d) ice
4. 4.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, ice 2 N, a glass sheet 4 N, a wooden plank 5 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) a glass sheet
6. 6.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 13 N, a glass sheet 3 N, a wooden plank 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
7. 7.🛞 Is friction helpful or a problem here: striking a matchstick? (a) helpful (b) a problem
8. 8.True or false: chalk on a gym bar gives more friction. (a) False (b) True
9. 9.🛞 Is friction helpful or a problem here: walking without slipping? (a) a problem (b) helpful
10. 10.🛞 More or less friction: a box pushed on carpet? (a) more friction (b) less friction
11. 11.🛞 Is friction helpful or a problem here: machine parts heating up? (a) helpful (b) a problem
12. 12.True or false: oil on a squeaky hinge gives more friction. (a) True (b) False
13. 13.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, ice 2 N, a wooden plank 3 N, a carpet 5 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) sandpaper (d) a carpet
14. 14.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 11 N, sandpaper 15 N, ice 4 N, a glass sheet 8 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a glass sheet
15. 15.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 7 N, sandpaper 11 N, ice 4 N. Which surface gave the least friction? (a) a wooden plank (b) ice (c) a carpet (d) sandpaper
16. 16.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) oil on a squeaky hinge (c) skating on ice (d) a tyre with deep treads
17. 17.🛞 Which surface gives the MOST friction to a sliding block? (a) ice (b) polished marble (c) sandpaper (d) glass
18. 18.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 6 N, a carpet 10 N, ice 2 N, a glass sheet 5 N. How many newtons more were needed on a carpet than on ice?
19. 19.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) chalk on a gym bar (c) a grippy rubber sole (d) a rough doormat
20. 20.🛞 Is friction helpful or a problem here: brakes stopping a cycle? (a) helpful (b) a problem
21. 21.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a grippy rubber sole (d) a wet tiled floor
22. 22.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 2 N, a carpet 5 N, sandpaper 6 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
23. 23.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
24. 24.True or false: sand on a slippery path gives less friction. (a) True (b) False
25. 25.True or false: a box pushed on carpet gives more friction. (a) False (b) True
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a wooden plank 7 N, a carpet 9 N, ice 1 N. How many newtons more were needed on a carpet than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 5 N, sandpaper 7 N, ice 3 N. Which surface gave the least friction? (a) a wooden plank (b) sandpaper (c) ice (d) a glass sheet
28. 28.🛞 More or less friction: a rough doormat? (a) less friction (b) more friction
29. 29.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 5 N, a carpet 8 N, sandpaper 12 N, ice 2 N. Which surface gave the least friction? (a) ice (b) sandpaper (c) a carpet (d) a wooden plank
30. 30.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a wooden plank 7 N, a carpet 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) sandpaper
31. 31.🔍 Which is the odd one out? (a) a wheel on ball bearings (b) a wet tiled floor (c) sand on a slippery path (d) powder on a carrom board
32. 32.True or false: a tyre with deep treads gives less friction. (a) False (b) True
33. 33.True or false: sand on a slippery path gives more friction. (a) True (b) False
34. 34.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) oil the moving parts (d) make parts rough
35. 35.🔍 Which is the odd one out? (a) a smooth steel slide (b) a wheel on ball bearings (c) a box pushed on carpet (d) skating on ice
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 6 N, sandpaper 10 N, ice 3 N, a wooden plank 5 N. How many newtons more were needed on sandpaper than on ice?
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 15 N, a glass sheet 3 N, a wooden plank 7 N, a carpet 11 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a wooden plank (d) a glass sheet
38. 38.🔍 Which is the odd one out? (a) a smooth steel slide (b) skating on ice (c) chalk on a gym bar (d) oil on a squeaky hinge
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 5 N, sandpaper 7 N, a glass sheet 2 N, a wooden plank 3 N. Which surface gave the most friction? (a) a glass sheet (b) sandpaper (c) a wooden plank (d) a carpet
40. 40.🛞 Rubbing your hands fast makes them … (a) warm (b) magnetic (c) wet (d) cold

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